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PRINCIPAL ACCOUNTING POLICIES - Revenue recognition (Details) - Services | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
PRINCIPAL ACCOUNTING POLICIES |  |  |
Percentage of packaged-tour product and services revenues recognized at net basis | 90.00% | 90.00% | 90.00%
Concentration Of Risk Number Of Other Services | 0 | 0 | 0
Percentage of transportation ticketing services revenue | 90.00% | 90.00% | 90.00%

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- Definition Concentration of risk number of other services. + References No definition available. + Details
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Namespace Prefix: | tcom_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of packaged-tour product and services revenues recognized at net basis. + References No definition available. + Details
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Namespace Prefix: | tcom_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of transportation ticketing services revenue. + References No definition available. + Details
Name: | tcom_PercentageOfTransportationTicketingServicesRevenue
Namespace Prefix: | tcom_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration